What process was responsible for producing gases and formed the early atmosphere?

Early atmosphere did not have oxygen. What was the source/s of oxygen?

Carbon dioxide, nitrogen, methane, water vapor were already present in the Early Earth. This statement is

What was the reason why plants and bacteria survive in the early Earth?

In which layer of the atmosphere do you find rain, snow and clouds

What is the most common gas in the atmosphere?

In which layer of the atmosphere is ozone found?

What have CFC's done to Earth and its atmosphere?

How have man's activities chnaged the compostion of our atmosphere?

Earth's atmosphere is divided into layers that are based upon their

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